@NIMMAGADDAM

Have a data page source with data transform and in the data transform have your logic to copy the 2nd data page results to 1st data page.

Inside data transform you could make use of Append and Map To method and copy the data page results to 1st data page context. Attached screen-shot for reference.

Just make sure to refer the 2nd data page information in data transform - pages and classes tab.

Copying the needed results to Primary.pxResults will result in adding a new page list entries to data page results context.

@NIMMAGADDAM

you can use Data Transform / Activity as source and use your secondary data page in there

or 

you can also use post data transforms to append desired values from another data page to your primary data page